BROKE LAPTOP SCREEN

Hello,
I HAVE A APPLE M5884 THAT GOT STEPPED ON AND DISTROYED THE LID AND SCREEN. SO I HOOKED IT TO A DESKTOP MONITOR (NEC MULTIsync LCD 1545V) AND IT WORKED GREAT.BUT THE PROBLEM IS THAT I MOVED IT NOW CANT GET IT TO WORK AGAIN. I CANT REMEMBER WHAT I DID TO GET IT TO WORK THE FIRST TIME. THE MONITORS GREEN LIGHT COMES ON AND I GET A MESSAGE NO SIGNAL THEN IT GOES INTO STANDBY . I HAVE NO SCREEN ON THE LAPTOP THE ONLY WAY I CAN TELL THAT ITS ON IS THE LIGHT ON THE CAPS IS GREEN. SURE COULD USE SOME HELP THANK YOU.